CCS Technical Documentation RH-17 Series Transceivers Troubleshooting — Antennas Issue 1 04/2003 Confidential Nokia Corporation
RH-17 Troubleshooting — Antennas Page 2 Nokia Corporation CCS Technical Documentation Confidential Issue 1 04/2003
CCS Technical Documentation RH-17 Troubleshooting — Antennas Contents Page No Troubleshooting - Antennas........................................................................................... 5 Appearance of the Phone .............................................................................................5 Failures and Corrective Measures ...............................................................................6 Missing Internal Antenna or Whip Antenna .....................................
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RH-17 Troubleshooting — Antennas CCS Technical Documentation Troubleshooting - Antennas This troubleshooting guide addresses potential failures that will affect the antenna performance of the RH-17 phone, and how to correct these failures. For additional information, refer to Haukka Antenna RF Specifications and Plan (DHS02290-EN-1.
RH-17 Troubleshooting — Antennas CCS Technical Documentation Failures and Corrective Measures Missing Internal Antenna or Whip Antenna Figure 4: RH-17 D-cover assembly Note that the whip antenna must be inserted prior to inserting the internal antenna. If the internal antenna is missing, install one. If the radiator looks obviously damaged, then replace the internal antenna. If no antenna is installed, the antenna gain will be degraded by more than 25 dB.
CCS Technical Documentation RH-17 Troubleshooting — Antennas the radiator has a significantly different shape, then the correct internal antenna must be installed. Be aware that the shape of the slot can vary slightly. The length of the horizontal slot can vary by a few millimeters, because the antennas are tuned for each batch of plastic frames. If there is any other obvious damage to the radiator (dents, corrosion), then the antenna should be replaced.
RH-17 Troubleshooting — Antennas CCS Technical Documentation Obstructed RF Feed and Ground Pads for the Internal Antenna Figure 7: PWB layout of RF feed and ground pads, and bottom antenna clip If the RF feed pad is obstructed, removed, or covered, then the RF feed pin will not touch the PWB and then the antenna gain will degrade by more than 25 dB. If the ground pad is obstructed, removed, or covered, then the ground pin will not touch the PWB, and then the antenna gain may degrade about 5 to 10 dB.
RH-17 Troubleshooting — Antennas CCS Technical Documentation Obstructed Whip Stopper Figure 9: Whip stopper as shown when the whip is fully retracted If the whip stopper is corroded or blocked by the whip straw, then the whip assembly needs to be replaced. If the whip stopper is obstructed or dirty, then the obstruction and/or dirt needs to be removed.
RH-17 Troubleshooting — Antennas CCS Technical Documentation The following figures show the contact between the display frame ground clips and the PWB in greater detail.
CCS Technical Documentation RH-17 Troubleshooting — Antennas Figure 13: Contact between left ground clip of display frame and side plating of PWB. Figure 14: Contact between right ground clip of display frame and side plating of PWB.
RH-17 Troubleshooting — Antennas CCS Technical Documentation Misinstalled Whip Figure 15: Locking feature for whip The whip is locked into the D-cover when the internal antenna frame is installed. There is feature in the plastic frame of the internal antenna that interlocks with the locking feature of the whip. The whip plug has the locking feature, and also has a "key" that is supposed to make it difficult to install the whip plug with the wrong rotation.
RH-17 Troubleshooting — Antennas CCS Technical Documentation tor is installed upside down, then the pads are not soldered to the PWB and the inductor needs to be flipped and soldered correctly. RF Connector Failure The RF connector could fail by not connecting the RF input to the RF output of the RF connector. If this happens, then the antenna gain will degrade by about 25 dB. This can be checked by testing for DC conductivity between the RF input and RF output of the RF connector.
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